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| Full Name | Wolfgang McKee |
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Hello,
Yes you can add special mosfet, or for that matter any mosfet specs, by just changing the values of the N-channel MOSFET (included in Electrical library on side panel) parameters. IRLML2502 is a N-channel MOSFET and you can easily model it using our N-Channel MOSFET element from electrical library. I encourage you to go through MOSFET section of the document “OptiSPICE_Element_Library” to understand the symbols of the model.
MCP6021 op-amp can also be build using traditional NPN OR PNP transistors available in the electrical library. You can even use your IRLML2502 once you have modelled it correctly and it gives you desired response (compare the response from the data sheet you referring). Once you create a final schematic for the MCP6021 op-amp, you can create a sub-circuit of the whole schematic with 5 ports (MCP6021 has 5 ports). You can go through the section “Creating Sub-Circuits” of the document “OptiSPICE_Tutorials-Advanced” in order to understand how to create a sub-circuit out of schematic.
I suggest you to check the internal schematic for the MCP6021 op-amp first and after you finish your schematic using mosfets, compare its performance from the data-sheet. Then create a sub-circuit out of it. Then you can save this sub-circuit into your own library by creating a new library (shown in section “Creating Sub-Circuits” of the document “OptiSPICE_Tutorials-Advanced”). You can also save this sub-circuit in any of the existing libraries as well.
Hope this helps!
Let me know if you have any further questions.
Best,
Saurabh Bedi.
Hello,
Yes you can add special mosfet, or for that matter any mosfet specs, by just changing the values of the N-channel MOSFET (included in Electrical library on side panel) parameters. IRLML2502 is a N-channel MOSFET and you can easily model it using our N-Channel MOSFET element from electrical library. I encourage you to go through MOSFET section of the document “OptiSPICE_Element_Library” to understand the symbols of the model.
MCP6021 op-amp can also be build using traditional NPN OR PNP transistors available in the electrical library. You can even use your IRLML2502 once you have modelled it correctly and it gives you desired response (compare the response from the data sheet you referring). Once you create a final schematic for the MCP6021 op-amp, you can create a sub-circuit of the whole schematic with 5 ports (MCP6021 has 5 ports). You can go through the section “Creating Sub-Circuits” of the document “OptiSPICE_Tutorials-Advanced” in order to understand how to create a sub-circuit out of schematic.
I suggest you to check the internal schematic for the MCP6021 op-amp first and after you finish your schematic using mosfets, compare its performance from the data-sheet. Then create a sub-circuit out of it. Then you can save this sub-circuit into your own library by creating a new library (shown in section “Creating Sub-Circuits” of the document “OptiSPICE_Tutorials-Advanced”). You can also save this sub-circuit in any of the existing libraries as well.
Hope this helps!
Let me know if you have any further questions.
Best,
Saurabh Bedi.
Hi,
I need to be sure what you are trying to extract here in this circuit? May be if you can share your file, I can look into detail. But generally, if you put the probe after the fiber, it should measure the power coming out of the fiber (in Watts). And Probe after the photodiode should give you the current as a function of voltage.
I am not sure what you mean by reverse phase? Can you share the plot image and explain what you expect? In general, if the response you are getting is reversed then may be try to put the probe before the fiber and photodiode. See if the response is what you expect.
If not, then please share the circuit file on saurabh.bedi@optiwave.com, so that we can look into details of your simulation.
Best,
Saurabh Bedi.
Hi,
I need to be sure what you are trying to extract here in this circuit? May be if you can share your file, I can look into detail. But generally, if you put the probe after the fiber, it should measure the power coming out of the fiber (in Watts). And Probe after the photodiode should give you the current as a function of voltage.
I am not sure what you mean by reverse phase? Can you share the plot image and explain what you expect? In general, if the response you are getting is reversed then may be try to put the probe before the fiber and photodiode. See if the response is what you expect.
If not, then please share the circuit file on saurabh.bedi@optiwave.com, so that we can look into details of your simulation.
Best,
Saurabh Bedi.
Hi,
Yes you can plot the I-V characteristics of the Laser. You should replace the pulse source with the DC source and sweep the DC voltage. Put a resistor in series to DC source and the Laser. Put one resistor with very high resistance (1000k Ohm) in parallel to the Laser. Put one probe to the Pin of the laser (direction of going into the laser) to measure the current going through laser as a function of swept vdc source. Put another probe to the wire connecting resistor to measure the voltage across (which is equal to the voltage across Laser).
The schematic of the testing circuit is attached along.
Hope this answers your question.
Hi,
Yes you can plot the I-V characteristics of the Laser. You should replace the pulse source with the DC source and sweep the DC voltage. Put a resistor in series to DC source and the Laser. Put one resistor with very high resistance (1000k Ohm) in parallel to the Laser. Put one probe to the Pin of the laser (direction of going into the laser) to measure the current going through laser as a function of swept vdc source. Put another probe to the wire connecting resistor to measure the voltage across (which is equal to the voltage across Laser).
The schematic of the testing circuit is attached along.
Hope this answers your question.
Hello Sylwia,
I am not sure I understand your approach correctly. There might be a convergence issue.
Can you share your file so that I can take a close look?
Best,
Saurabh Bedi.
Hello Sylwia,
I am not sure I understand your approach correctly. There might be a convergence issue.
Can you share your file so that I can take a close look?
Best,
Saurabh Bedi.
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